ARTHROPODA 



PHYLUM VII 



790 



and eight. Arthrohjcosa Harger (Fig. 1520), and Protolycosa Roemer (Fig. 1521), are 

 CurboiiiftTon^; examples, but tlie majority of forms are known from Oligocene amber 

 fouii.l Oll llic slu.ivs of the Baltic in Fast Prussia. Mizalia Koch (Fig. 1522) is an 



Fig. 1520. 



Arthrolycosa antiqua Harger. Goal Measures 

 Mazon Creek, Illinois, i/i (after Petrunkevitch). 



Fig. 1521. 



Protolycosa anthra- 

 cophila Roemer. 

 Goal Measures ; 

 Myslowitz, Silesia. 

 (after F. Roemer). 



Fig. 1522. 



Mizalia rostrata Koch and 

 Berendt. Oligocene ; Baltic 

 amber. 3/,. 



Fig. 1523. 



A ttoides eresiformis Brongt. 

 Oligocene ; Aix in Provence. 

 lO/x (after Brongniart). 



Fig. 1524. 



Thomisns oeningensis 

 Heer. Fresh water Mio- 

 cene ; Oeningen, Baden. 

 '•2/1 (after Heer). 



example from the latter locality ; Attoides Brongt. (Fig. 1523) occurs in the fresh - 

 water Oligocene marls of Aix in Provence, and Thomisus Walck. (Fig. 1524) in 

 similar deposits of Miocene age at Oeningen, Baden. The Upper Oligocene lignites 



of Rott, near Bonn, Ger- 

 many, and the Miocene fresh- 

 water strata of Florissant, 

 Colorado, have also yielded 

 remains of this order. Among 

 Eocene localities, from which 

 fossil Spiders have been ob- 

 tained, should be mentioned 

 the Green River beds of 

 Wyoming, and the strata at 

 Quesnel, British Columbia. 

 The known species of fossil 

 Spiders aggregate about 250. 

 The Order Anthraco- 

 marti is confined to the 

 Paleozoic, and is perhaps 

 ancestral to the Pedipalps 

 and Opiliones, being in some 

 Its distinguishing characters are as follows : 



Fio. ] 



•'^ M.'as.uvs; Xeu- 



ity.n-, .>i.>-m;i. Dorsal aspoct. 

 Vi (after Karsch). 



FlO. VyOi 



Goal M.,i 

 land. I) 



• V'<-tncd (Buckland). 

 ^ , < <).ill)iookdale, Eng- 

 ' ■■i^l'i'ft, shovving ten 



i?'?\. •'""'*^"^^ of the hind-bodv. 



Vi (aftei \Vood\\ard\ 



Kl\vc(.ai them. 



J 



